I think they are all plenty accurate, it just comes down to cost vs ease of use.
The Shooting Chrony, Competition Electronics, etc are all fine and cost effective. However, they take more time and effort to set up. This also includes walking in front of the firing line if you are at a range, which can be a pain.
The magneto works, but I don't like having anything attached to my barrel, when I'm load testing I want to see how it groups, having something hanging off the barrel will alter the group results.
The radar types aren't any more accurate than others, just easier to set up. No walking in front of the firing line and aligning the bore with the chronograph. It also decreases the chances of shooting your chronograph!
The Shooting Chrony, Competition Electronics, etc are all fine and cost effective. However, they take more time and effort to set up. This also includes walking in front of the firing line if you are at a range, which can be a pain.
The magneto works, but I don't like having anything attached to my barrel, when I'm load testing I want to see how it groups, having something hanging off the barrel will alter the group results.
The radar types aren't any more accurate than others, just easier to set up. No walking in front of the firing line and aligning the bore with the chronograph. It also decreases the chances of shooting your chronograph!